That is unreal!

I was reading on the website of QEC.....that they Beaver river has a recoverable 120-540 Bcf of gas....now with my calculations...using 120Bcf, doesn't that work out to just over 21 billion barrel of oil equiv? Now I used an online calculator for that.....so if I am off, please let me know! Also, how do they companies determine how much gas is down there? Like what time of tests do they do when they give us these proven values.....now I am not sure about the 120Bcf...but they said it is recoverable from the 1.4 Tcf. Hey Okkeg, can you give your insight on this just to clear up any misconceptions.

Thanks, Rocco.